JPH044943U

JPH044943U -

Info

Publication number: JPH044943U
Application number: JP4597990U
Authority: JP
Priority date: 1990-04-27
Filing date: 1990-04-27
Publication date: 1992-01-17

Description

[Brief explanation of the drawing]

第１図はこの考案にかかる給油装置を示す回路
図、第２図はこの考案の給油装置におけるピン結
合部の断面図、第３図は油圧シヨベルの側面図、
第４図は第３図のＡ−Ａより見た従来技術の給油
装置をそなえたピン結合部の断面図、第５図はブ
ツシユのたて断面図である。３……作業アタツチメント、４……ブーム、８
……アームシリンダ、１０，１０′，１１……ピ
ン結合部、１２，２４……給油装置、１３，２５
……基端部、１７，１８，３１，３２……ブツシ
ユ、１９，１９′……結合ピン、２９……油供給
ポート、３０……油排出ポート、３３……シール
部材、３４……潤滑用油室、３５……ヘツド側油
室、３７……絞り部、３８……リリーフ弁。 FIG. 1 is a circuit diagram showing the oil supply device according to this invention, FIG. 2 is a sectional view of a pin joint in the oil supply device of this invention, and FIG. 3 is a side view of a hydraulic excavator.
FIG. 4 is a cross-sectional view of a pin joint equipped with a conventional lubricating device taken along line A--A in FIG. 3, and FIG. 5 is a vertical cross-sectional view of the bush. 3...Work attachment, 4...Boom, 8
... Arm cylinder, 10, 10', 11 ... Pin joint, 12, 24 ... Oil supply device, 13, 25
... Base end part, 17, 18, 31, 32 ... Bush, 19, 19' ... Connection pin, 29 ... Oil supply port, 30 ... Oil discharge port, 33 ... Seal member, 34 ... Lubrication oil chamber, 35...head side oil chamber, 37...throttle section, 38...relief valve.

Claims

[Scope of Claim for Utility Model Registration] (1) A boom, an arm, and a working tool are connected to the front part of an upper revolving structure, and the boom, arm, and working tool are rotated by a hydraulic cylinder such as a boom cylinder and an arm cylinder. In this working attachment, a lubricating oil chamber is provided inside the pin joint part that communicates with the bush and the sliding part with the connecting pin, and an oil discharge port of the oil supply port is provided in the lubricating oil chamber, and the oil supply port is connected to the oil supply port. and the passageway leading to the head side oil chamber of the hydraulic cylinder are communicated through a relief valve and a throttle part, and the oil discharge port and the passageway leading to the rod side oil chamber of the hydraulic cylinder are connected through a check valve. When the relief valve performs a relief operation when the pressure rises in the head side oil chamber of the hydraulic cylinder, the oil in the channel leading to the head side oil chamber is supplied to the lubricating oil chamber inside the pin joint. A lubricating device for a pin joint, characterized in that it is configured as follows. (2) A boom, an arm, and a work tool are connected to the front part of the upper revolving structure, and a work attachment is attached so that the boom, arm, and work tool are rotated by a hydraulic cylinder such as a boom cylinder or an arm cylinder, and The base end of the boom is formed by integrally fixing bosses to both the left and right ends of the pipe,
In the pin joint part that supplies oil and fat to the base end for lubrication, a seal member is provided between the outer ends of the bushings fitted on the left and right sides of the base end and the outer periphery of the joint pin. is provided to form a lubricating oil chamber in the base end, and the lubricating oil chamber is provided with an oil supply port and an oil discharge port, and the oil supply port is connected to a channel leading to the head side oil chamber of the arm cylinder. are communicated through a relief valve and a throttle section, and the oil discharge port and the passageway leading to the rod side oil chamber of the arm cylinder are communicated via a check valve, thereby increasing the high pressure in the head side oil chamber of the arm cylinder. An oil supply device for a pin joint portion, characterized in that, when the relief valve performs a relief operation, oil in the channel leading to the head side oil chamber is supplied to a lubricating oil chamber in the base end portion.